More than 600 passengers and crew members fell ill aboard a Royal Caribbean cruise ship, with symptoms that included vomiting and diarrhea.
The Centers for Disease Control said on Monday the latest figure includes 577 passengers and 49 crew members.
The company earlier said a 10-day Caribbean cruise by the Explorer of the Seas would end two days early, with the ship returning to its home port in New Jersey on Wednesday.
The ship was carrying 3050 passengers and a crew of 1165. It left Cape Liberty, New Jersey on 21 January.
The CDC said on Monday the cause of the sickness was unknown.